|Title||Quantum Key Distillation from Gaussian States by Gaussian Operations|
|Publication Type||Journal Article|
|Year of Publication||2005|
|Authors||Navascués, M, Bae, J, Cirac, IJ, Lewenstein, M, Sanpera, A, Acín, A|
|Journal||Physical Review Letters|
We study the secrecy properties of Gaussian states under Gaussian operations. Although such operations are useless for quantum distillation, we prove that it is possible to distill a secret key secure against any attack from sufficiently entangled Gaussian states with nonpositive partial transposition. Moreover, all such states allow for key distillation, when Eve is assumed to perform finite-size coherent attacks before the reconciliation process.